Themethodofttestisadoptedinthecomparisonoftheaverageoftwogroupsofnumbers,whileamethodofsinglefactorvarienceanaysisisusedtocomparemulti-columnvarience,andanotherbetween-columnttestisconductedbaseduponthefactthatbetween-columndifferencecanbemeasuredbymeansofstatistics.